Match the type of crystal given in List I with example in List II.
`{:("List I","List II"),("P. Ionic",1.AIN),("Q. Network ", 2.Mg),("R. Metallic", 3.MgO),("S. Molecular", 4."Solid " CO_2):}`

Options

A. `{:(P,Q,R,S),(3,1,4,2):}`
B. `{:(P,Q,R,S),(3,1,2,4):}`
C. `{:(P,Q,R,S),(1,3,2,4):}`
D. `{:(P,Q,R,S),(4,2,3,1):}`

Answer

To match the types of crystals in List I with the examples in List II, we will analyze each type of crystal and its corresponding example step by step.

### Step 1: Identify Ionic Crystals
- **Definition**: Ionic crystals are made up of ions held together by electrostatic forces (Coulombic attraction).
- **Example from List II**:
- **3. MgO**: This is magnesium oxide, which consists of Mg²⁺ and O²⁻ ions.
- **Conclusion**: The type of crystal "P. Ionic" matches with "3. MgO".

### Step 2: Identify Network Crystals
- **Definition**: Network crystals consist of atoms connected by covalent bonds in a three-dimensional lattice.
- **Example from List II**:
- **1. AIN**: Aluminum nitride forms a three-dimensional network of atoms bonded covalently.
- **Conclusion**: The type of crystal "Q. Network" matches with "1. AIN".

### Step 3: Identify Metallic Crystals
- **Definition**: Metallic crystals are composed of metal atoms that share a "sea of electrons", allowing for conductivity and malleability.
- **Example from List II**:
- **2. Mg**: Magnesium is a metal and thus represents a metallic crystal.
- **Conclusion**: The type of crystal "R. Metallic" matches with "2. Mg".

### Step 4: Identify Molecular Crystals
- **Definition**: Molecular crystals are made up of molecules held together by intermolecular forces, not forming a three-dimensional network.
- **Example from List II**:
- **4. Solid CO₂**: Solid carbon dioxide (dry ice) is a molecular solid where the constituent particles are CO₂ molecules.
- **Conclusion**: The type of crystal "S. Molecular" matches with "4. Solid CO₂".

### Final Matching
- P. Ionic → 3. MgO
- Q. Network → 1. AIN
- R. Metallic → 2. Mg
- S. Molecular → 4. Solid CO₂

### Summary of Matches:
- P → 3
- Q → 1
- R → 2
- S → 4

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